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Date:   Fri, 14 Jun 2019 22:25:18 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Oscar Salvador <osalvador@...e.de>, Qian Cai <cai@....pw>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jmoyer <jmoyer@...hat.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH -next] mm/hotplug: skip bad PFNs from pfn_to_online_page()

On 6/14/19 10:06 PM, Dan Williams wrote:
> On Fri, Jun 14, 2019 at 9:26 AM Aneesh Kumar K.V
> <aneesh.kumar@...ux.ibm.com> wrote:

>> Why not let the arch
>> arch decide the SUBSECTION_SHIFT and default to one subsection per
>> section if arch is not enabled to work with subsection.
> 
> Because that keeps the implementation from ever reaching a point where
> a namespace might be able to be moved from one arch to another. If we
> can squash these arch differences then we can have a common tool to
> initialize namespaces outside of the kernel. The one wrinkle is
> device-dax that wants to enforce the mapping size,

The fsdax have a much bigger issue right? The file system block size is 
the same as PAGE_SIZE and we can't make it portable across archs that 
support different PAGE_SIZE?

-aneesh

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